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John Richard Thome

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Publications associées (260)

Sudden expansions in circular microchannels: flow dynamics and pressure drop

John Richard Thome, Navid Borhani, Sepideh Khodaparast

Micro particle shadow velocimetry is used to study the flow of water through microcircular sudden expansions of ratios e = 1.51 and e = 1.96 for inlet Reynolds numbers Re (d) < 120. Such flows give rise to annular vortices, trapped downstream of the expans ...

Springer Heidelberg2014

3D ALE Finite-Element Method for Two-Phase Flows With Phase Change

John Richard Thome, Navid Borhani, Gustavo Rabello Dos Anjos

We seek to study numerically two-phase flow phenomena with phase change through the finite-element method (FEM) and the arbitrary Lagrangian-Eulerian (ALE) framework. This method is based on the so-called one-fluid formulation; thus, only one set of equati ...

Taylor & Francis2014

A 3D moving mesh Finite Element Method for two-phase flows

John Richard Thome, Navid Borhani, Gustavo Rabello Dos Anjos

A 3D ALE Finite Element Method is developed to study two-phase flow phenomena using a new discretization method to compute the surface tension forces. The computational method is based on the Arbitrary Lagrangian-Eulerian formulation (ALE) and the Finite E ...

Elsevier2014

Application of micro particle shadow velocimetry mu PSV to two-phase flows in microchannels

John Richard Thome, Navid Borhani, Sepideh Khodaparast

Micro particle shadow velocimetry (mu PSV) is performed in the present study for simultaneous velocity measurement and interface tracking in both liquid-liquid and gas-liquid two-phase flows through circular microchannels of 5001 mu m diameter. The back-li ...

Pergamon-Elsevier Science Ltd2014

Thermo-Electric Analogy Method for Computing Transient Heat Transfer in a New Reciprocating Finned Piston Compressor

Alfred Rufer, John Richard Thome, Mahbod Heidari

In the framework of Isothermal Compressed Air Energy Storage (CAES), a new finned piston compressor has been designed and realized at LEI laboratory in EPFL. This system comprises a series of concentric annuli’s fitting into each other compressing the air ...

2014

Modeling of Two-Phase Evaporative Heat Transfer in Three-Dimensional Multicavity High Performance Microprocessor Chip Stacks

John Richard Thome, Yassir Madhour, Jackson Braz Marcinichen, Bruno Michel, Brian Paul D'Entremont

Three-dimensional (3D) stacking of integrated-circuit (IC) dies increases system density and package functionality by vertically integrating two or more dies with area-array through-silicon-vias (TSVs). This reduces the length of global interconnects and t ...

American Society of Mechanical Engineers2014

Intermittent dewetting and dryout of annular flows

John Richard Thome, Navid Borhani

Flow visualisation of saturated flow boiling of refrigerant R245fa in a silicon parallel multi-microchannel evaporator, at low mass flux and moderate uniform heat flux, has been carried out with a high-speed digital camera. Using the time-strip technique t ...

Pergamon-Elsevier Science Ltd2014

Asymmetric annular flow in horizontal circular macro-channels: Basic modeling of liquid film distribution and heat transfer around the tube perimeter in convective boiling

John Richard Thome, Andrea Cioncolini

This paper presents the modeling of the liquid film distribution and heat transfer during convective boiling in horizontal, annular flows to be applied in such applications where non-uniform heat flux occurs. In general, prediction methods in the literatur ...

Pergamon-Elsevier Science Ltd2014

Dynamic flow control and performance comparison of different concepts of two-phase on-chip cooling cycles

John Richard Thome, Jackson Braz Marcinichen, Duan Wu, Bruno Michel

A hybrid on-chip two-phase cooling cycle specifically designed to cool server boards with chips of high performance computers was experimentally evaluated considering steady-state and transient operation of two parallel pseudo-chips and auxiliary electroni ...

Elsevier2014

A new type of flow structure in cocurrent adiabatic vertically downward air-water flow: Membrane flow

John Richard Thome, Navid Borhani, Marco Milan

A new type of flow structure has been observed in cocurrent adiabatic vertically downward air-water flow and is described here. Membranes, in the form of thin liquid films spanning the channel cross-section and horizontally dividing the gas core were visua ...

Elsevier2014

Boiling Augmentation With Micro/Nanostructured Surfaces: Current Status And Research Outlook

John Richard Thome

Advances in the development of micro- and nanostructured surfaces have enabled tremendous progress in delineation of mechanisms in boiling heat transfer and have propelled the rapid enhancement of heat transfer rates. This area of research is poised to mak ...

Taylor & Francis Inc2014

Proposed models, ongoing experiments, and latest numerical simulations of microchannel two-phase flow boiling

John Richard Thome, Sylwia Szczukiewicz, Mirco Magnini

A survey of the most recent work aimed at physically characterizing local heat transfer in flow boiling in microchannels is presented. This includes recent experimental work, new flow boiling prediction methods, and numerical simulations of microchannel sl ...

Elsevier2014

Numerical investigation of hydrodynamics and heat transfer of elongated bubbles during flow boiling in a microchannel

John Richard Thome, Mirco Magnini

Flow boiling within microchannels has been explored intensively in the last decade due to their capability to remove high heat fluxes from microelectronic devices. However, the contribution of experiments to the understanding of the local features of the f ...

Elsevier2013

Advances in Electronics Cooling

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen, Nicolas Lamaison

This article highlights the advantages of on-chip microchannel cooling technology, based on first-and second-law analysis and experimental tests on two types of cooling cycles, the first driven by an oil-free liquid pump and the second by an oil-free vapor ...

Taylor & Francis2013

Experimental Evaluation of a Controlled Hybrid Two-Phase Multi-Microchannel Cooling and Heat Recovery System Driven by Liquid Pump and Vapor Compressor

John Richard Thome, Jackson Braz Marcinichen, Duan Wu

Elsevier2013

Numerical investigation of the influence of leading and sequential bubbles on slug flow boiling within a microchannel

John Richard Thome, Mirco Magnini

Multiphase CFD simulations are presently employed to investigate the flow boiling of multiple sequential elongated bubbles in a horizontal microchannel. Most of the computational studies published so far explored the features of boiling flows within microc ...

Elsevier2013

A micro particle shadow velocimetry (mu PSV) technique to measure flows in microchannels

John Richard Thome, Navid Borhani, Sepideh Khodaparast, Giulia Tagliabue

A micro particle shadow velocimetry (mu PSV) system based on back-lit illumination and forward scatter observation of light from non-fluorescent particles has been developed. Relatively high luminous efficiencies and particle image contrasts were achieved ...

Springer-Verlag2013

Two-phase flow operational maps for multi-microchannel evaporators

John Richard Thome, Navid Borhani, Sylwia Szczukiewicz

The current paper presents new operational maps for several different multi-microchannel evaporators, with and without any inlet restrictions (micro-orifices), for the two-phase flow of refrigerants R245fa, R236fa, and R1234ze(E). The test fluids flowed in ...

Elsevier2013

STEAM: a fast compact thermal model for two-phase cooling of integrated circuits

John Richard Thome, Yassir Madhour, David Atienza Alonso, Arvind Raj Mahankali Sridhar

Two-phase liquid cooling of computer chips via microchannels etched directly on silicon dies is a potential long-term solution to enable continued integration of high-performance multiprocessors. Two-phase cooling refers to the heat removal via evaporation ...

IEEE/ACM Press2013

Editorial: Eci Eighth International Conference on Boiling and Condensation Heat Transfer

John Richard Thome

Taylor & Francis2013

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